In:
Science, American Association for the Advancement of Science (AAAS), Vol. 336, No. 6082 ( 2012-05-11), p. 711-714
Abstract:
The stable carbon isotope ratio of atmospheric CO 2 (δ 13 C atm ) is a key parameter in deciphering past carbon cycle changes. Here we present δ 13 C atm data for the past 24,000 years derived from three independent records from two Antarctic ice cores. We conclude that a pronounced 0.3 per mil decrease in δ 13 C atm during the early deglaciation can be best explained by upwelling of old, carbon-enriched waters in the Southern Ocean. Later in the deglaciation, regrowth of the terrestrial biosphere, changes in sea surface temperature, and ocean circulation governed the δ 13 C atm evolution. During the Last Glacial Maximum, δ 13 C atm and atmospheric CO 2 concentration were essentially constant, which suggests that the carbon cycle was in dynamic equilibrium and that the net transfer of carbon to the deep ocean had occurred before then.
Type of Medium:
Online Resource
ISSN:
0036-8075
,
1095-9203
DOI:
10.1126/science.1217161
Language:
English
Publisher:
American Association for the Advancement of Science (AAAS)
Publication Date:
2012
detail.hit.zdb_id:
128410-1
detail.hit.zdb_id:
2066996-3
detail.hit.zdb_id:
2060783-0
SSG:
11
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